Here the signals that are transmitted are analog i think so, then the output in led will be analog too so how this is lifi ? I am working on LiFi since 2016. can you help me with the circuit diagram I have a simple question … if we switch the transmitter and receiver between two devices does it works in lifi technology? This application can be made with a highly encrypted algorithm. In block diagram 2.2uf is used & reciver circuit 100uf used. Personal project, Low-level Visible Light communication system. I thought the LED would be always ON and audio would be transmitting through it.!!!! You should not see any flicker. Thanks Aroloye, complete practical implementation is already explained in the above article, if you have specific questions you can feel free to ask me here, I'll try to solve it…. An application of Visual Light Communications, Lifi was announced as the faster, more secure, and energy-efficient successor of today’s WiFi, which can transmit data at speeds that are 100 multitudes faster. Update: The above design can be also tried using a single transistor as shown below: You can use a current limiting resistor series with LED if you want operate the circuit at higher voltage (say 12V).You can also use standard 0.5mm white LED with current limiting resistor. As long as the input is a high frequency signal, the LiFi will work across the selected devices. Thank a lot!! In the Receiver end I was using 6v Solar Panel 300mA along with capacitor and A House Amplifier. This article explains about the basic idea how to make a very simple LI-FI circuit in which we will be able to transfer any audio source through light and receive it from the receiver which is placed few feet from the Transmitter. …sorry, if you are having 6 separate signals then that becomes very simple, just make 6 separate Tx/RX modules using the design that's explained in the above article and get the required results. Hi Sujit,for higher frequencies you may probably have to employ a BTL kind of amplifier for driving the LED, which is also referred to as Class D amplifier…it's a digital version of an ordinary amplifier and will be able to handle high frequency music in the PWM form. hey swag the setup worked …I am getting audio output but i think the speakers are not good enough because the sound is very grainy. sir,Which capacitor used in solar celll 2.2uf or 100uf ?? The voltage drop across solar cell remains almost constantNow what shall we do to increase sensitivity of the panel? The transmitter circuit started working as soon as I connected the battery. also, I found some devices on the internet they work with the help of USB. The circuit works fine for frequency less than 7-8KHz square wave. What modification needed to use LDR to existing amplifier if I have to replace Solar Panel? Plz reply fast i have to submit it today evening. I powered the speaker through wall socket (230 V AC current). Here is a simple block diagram explaining LI-FI: The circuit consists of two parts, which are receiver and transmitter. and first make sure your amplifier is working OK, test it separately by feeding a music input from a cell phone's headphone socket. also, I found some devices on the internet they work with the help of USB. Sir please share ur email id. Now, I want to be able to transmit a video, in the same way you did in your TED talk a few years ago. The majority of applications exchange data in digital form. ololo, the minimum things are already specified in the article, you will just need those minimum things for the experiment, fresnel lens may not be necessary, please do exactly as explained in the article. thanks for sharing, Sir Have u got projects on internet generation and transmission using LiFi. If you succeed with that then we can proceed and modify it with an LED strip, and check the response! will you please suggest any specific transistor for that and if possible circuit diagram.thanx for reply, https://homemade-circuits.com/2013/10/class-d-amplifier-circuit-using-ic-555.html. This remarkable property allows diver-to-diver or diver-to-minisub communications, even if they are miles apart. Improving Driver Warnings Accuracy using Low-cost Sensors ... (Advanced Driving Assistance System) applications on smartphones. Now he has to come back and ask "where can i get more information about lifi" because you didn't teach him to learn, you just babied him and gave him the answer which is like cheating in school. A good read for anyone interested in Indoor Usage of Li-Fi. You may refer this link: https://homemade-circuits.com/2016/02/how-to-make-simple-laser-communicator.html, Really thanks for that information happy to learn from u more. please provide a detailed view, Good Morning,I used Proteus to simulate the transmitter circuit and it worked with a sine wave generator as the input.But during the implementation it did not work and when I later changed the input to an audio file,the led was not coming on.The receiver circuit is not working as well,will appreciate it if you can guide my through.My defense is next month and I haven't gotten to anywhere,though audio transmission using LiFi is cheap to my Lecturer as a final year project work,will as well appreciate it if you can recommend something better to me and guide me through it.Look forward to your speedy response,time is not on my side again. you can salvage it from an old calculator device…. Li-Fi (short for light fidelity) is wireless communication technology which utilizes light to transmit data and position between devices. In this paradigm, a smartphone need to connect with the sensitive information of a vehicle. But from wheres i will provide power supply i dont know, Means R1 connect to +ve and R6 connect to -ve of battery ?? make sure the LED lights up optimally during the presence of a music signal and shuts down completely in its absence…and also make sure no other light except the LED light falls on the light sensor. The project primarily targets sensor network applications. Very simple and useful project to understand the working of Li-Fi, you can also make your own Li-Fi device with a bit more modifications to the design and code provided. It makes this site, which is filled with great information, look stupid as it is catering to the worst form of ignorance. The input signal at the transmitter section can be modulated with a specific time period then send the data using LED bulbs in 0’s and 1’s form. the transistor can be any small signal transistor such as BC547 or 2N2222, and 8050 will also do. Ololo, sorry, I do not have any other article related to internet lifi other than this one. The amplifier need not to be the same illustrated here, but you can use any amplifier lying around your house. For an audio source you can use mp3 player, mobile phone or a microphone with pre-amplifier etc. Thank for your answer. This was my transmitter circuit. you should setup some ground rules for not answering questions that could be answered by a simple google search and 10 seconds of time. We got the audio outputThanks a lot for solving our doubts . What type of communication are you referring to? The transmitter consists of 3 transistors and few passive components paired with 1 watt LED. because Li-Fi is supposed to be used inside closed rooms. hey, yes you can connect the solar module directly to the input of your amplifier circuit, but make sure no ambient light reaches the solar module except the light from your Tx LED. Engineering Projects For You; 1001+ Electronics Projects For You; Design Your Own Li-Fi Dongle And Speaker. Check out this book for further information. and what is the distance between tx and rx to be placed, Sunil, as long as the light sensor is able to receive the light from the LED it will work, the distance will not matter, but you will make sure that no other ambient light reaches the sensor…. LiFi can transmit at multiple gigabits, is more reliable, virtually interference free and uniquely more secure than radio technology such as Wi-Fi or cellular. LiFi Communication Project Details In the application we try to implement a very low level Li-Fi data communication where we send some data through a small led at a low data rate. for transmitter part we are using almost same components (as shown in figure with 3 transistors)…, for receiver part we are using solar panel (5V 1.25W) followed by amplifier circuit with LM386, however we have not used 2.2uF capacitor in series with solar panel…, our receiver part is probably not working as we are not getting any sound in speakers…transmitter part is working as we have tested it with 5 Hz test tone as audio input, we were able to see LED flickering, Hi, please replace the photodiode with an LDR in the LN386 circuit, and make sure to connect a 2.2uF or any capacitor in the range, in series with the pin3 of the LM386. you can probably try to optimize the volume control for getting improved results, and reduce distortions. Since the bandwidth of visible light is 10,000 times more than Radio waves, more data can be transferred through light at short period of time. Am so happy SWATAGAM just because i managed to receive sound to my receiver end . But I still don't understand about how Li-Fi works when we just use our telephones. Start trying out LiFi technology yourself! Initially I chose BC548, but too weak to handle 1watt LED, so gone with stronger transistor BC337 these info can be found in the datasheet. Thanks, what exactly do you want to make using LiFi, I mean what kind of frequency do you intend to communicate with? But the concept is exactly the same. Whether the mentioned circuit will work for that range…. remote controls use a specific frequency and therefore ambient light is not able to affect its functioning, but for music the frequency range cannot be restricted and that could be a problem….to counter this, the IR receiver sensor may need to be covered in such a way that it is able to receive the music signals from the IR transmitter but remains hidden from the ambient light. Expecting the answer soon. If yes can you plz tell me those changes. Unlike radio waves, which are easily absorbed by water, light waves can travel great distances. Simple High voltage Generator Circuit – Arc Generator, 5 Simple Alarm Circuits for Protecting your Home/Office from Theft, Make this Simple Refrigerator Door Open Alarm Circuit, How to Make a Wireless Robotic Arm using Arduino, https://homemade-circuits.com/2016/02/how-to-make-simple-laser-communicator.html, Voltage Divider Calculator Software – Potential Divider Calculator. quality is not good or range . I used 6v Solar Panel with 2.2 capacitor and fed to amplifier. Security thanks, the answers to your questions will require long explanations, which may not be possible here…, can u provide us with the full schematic diagram of the tx and rx i really need them ahmedaly10026@yahoo.com. If there is no audio input, the LED stays solid ON, the solar cell produce some voltage. The receiver consists of a 6 volt solar cell (3 volts above works fine) in series with 2.2uf capacitor which is paired with an amplifier. LED stays SOLID ON even when no signal input is applied to transmitter that’s the property of LI-FI:- Light and also Communication. connected a stereo jack (3.5mm) to the radio. Our objectives are rolling out full scale projects to our customers, not only proof of concept. You can here clear audio sound on the receiving speaker. We use cookies to ensure that we give you the best experience on our website. The LED should stay solid ON even while data is being transmitting. Our eyes can’t pickup the flicker due to input signal. If I decrease the gain of the OP amp will it work ?Thanks again. Researchers reached bit rate of 224 GB/s which is 100s of times faster than our average WI-FI connection at home or office. yes it is OK, please read the previous comments to get a detailed idea of the circuit. The screen is powered by a wall socket. I’ll add your comment soon in the above article!! Our mission is to integrate LIFI technology into existing and future communication networks, into innovative products, large-scale projects to improve communications performance, data security, geolocation, energy efficiency and health. But make sure it as good sensitivity. I found the resistor values by trail and error method. That is WAAAY beyond my abilities so I thought since remote controls use infrared in bright conditions it might offer a solution with less interference. The solar cell replicates the small varying voltage, the capacitor will allow the small variation in voltage amplitude to amplifier and rejecting strong constant DC voltage. Ill try and change the speakers.for the transmitter part can we use 9v Vcc instead of 7.5v? In a room any user of LiFi can get a high-speed data connection no matter how many users are connected. I used different values of resistor and I found the above specified values optimal. I am only acquianted with the theory but i need help and guidance with the practical implementation.will appreciate it if i can get help and support from these, you can do well to connect with me on aroloyefolajimi@gmail.com.Look forward to your response,thanks. It did not work because your implementation is incorrectly done. I'll try to update a new diagram tomorrow using a photo diode. Li-Fi system mainly includes two parts namely the transmitter and receiver. You said infrared is possible, but do you think it would be less affected by ambient light with the right components? Hello Abdullhaq, the circuit can be use for transmitting all kinds of frequencies, so it should work with your function generator output also, first make sure that your function generator output has only pulsating DC and no constant DC…and the solar cell gets no other ambient light except the function generator frequency light. I have a preamplified speaker and it a has 3.5mm jack input., Can i directly connect the solar panel to it? First check whether your amplifier is actually working or not? OK, I think I got it, higher voltage pulses will push proportionately more current to the base of the transistor and produce equivalent change in the brightness. divide the supply voltage with 1.5V, and you will get the max number of LEDs that can be accomodated in series. If my building has error or has to change the transistor then Please suggest a Circuit where LED would be always ON – With Signal or No Signal. The project will initially compare state-of-the-art techniques such as multicarrier transmission techniques such as orthogonal frequency division multiplexing (OFDM), pulse-amplitude modulation (PAM) and carrier-less amplitude modulation (CAP). Two-Way Wireless Data Messaging System in Rural Areas using Zigbee: This project provides the two-way message communication system for rural areas where there is no signals from mobile service providers and also for applications which require high encryption and decryption of data. either you must elevate the music input power or enhance the BJT stages in order to increase its sensitivity which perhaps can be done by converting the BJTs into Darlington pairs. Gajendra, solar cell will be easier to configure, photo diode will require some technical consideration…so solar cell is the easier option. it's the specification of the solar cell…it's also not so critical. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. Each light pool provides full channel data rates with fewer simultaneous users than conventional radio technology. I would like to connect Li-Fi receiver to the FPGA . Don't we need any microcontrollers for doing lifi?? I appreciate your suggestion, and I quite agree with you. The main way we transmit wireless data is by using electromagnetic waves, in particular radio waves. The transistors are configured as common emitter amplifiers which alters the LED brightness with respect to audio signal. Thanks for your response,i want to be specific reason with what I will be buying in the market for the project. thanks for the info swag.Does this mean that this system wouldn’t work in a well-lit room? In a room any user of LiFi can get a high-speed data connection no matter how many users are connected. Li-Fi is a light based Wi-Fi it uses light instead of radio waves to transmit information. Place the 1 Watt LED parallel to solar cell. Though BC338 giving good LED Illumination. The input stage has capacitors at each transistor’s base for blocking DC signals which could degrade the quality of output. Ololo, the explanation for a digital LIfi circuit is given in the above article, so please go through it for detailed understanding. Will you please tell me a circuit which work upto nearly 500KHz. hope you add some more in future also. What kind of LED and photodiode do you use ? Please give me the specifications to save me the stress of mixing things up. Notify me via e-mail if anyone answers my comment. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. you are just using the straight analog audio signal to amplitide modulate (AM as in medium wave radio) the light intensity. Thank a lot. Hi Amarnath, the gain of the shown LM386 amp circuit is already set at the max 200 range. Thank you. In addition, I connected a 9V battery with a 1k ohm resistor to the anode and cathode of the same LED. Who can help me explain this problem? Sir, can u please make some video showing connections and working of the project. When we apply audio signal at transmitter there will be change in the LED’s brightness (Very small). that’s fine ATR, just touch the 3.5mm pin tip, if that makes a loud noise on the speakers then your system is ready for the solar chip integration, which can be connected across the 3.5 mm jack’s relevant inputs. appreciate your efforts, however a video signal cannot be transmitted through a LED so easily, because a video signal may have many complex frequency data embedded together which cannot be transmitted or received without special encoders and decoder circuits. You are welcome ATR, you can try those solar chips, it should work!! Does this mean that it’s OK? Thanks for sharing this is really helpful for me and also for my upcoming project. Thank you, Amarnath, no changes would be required for the signal generator signal, it's also a kind of frequency so will work just as a music input is supposed to work, Thank you sir, I was able to give the input via a signal generator but it seems I'm only able to transmit and reciece square waves.. Other waves(above 0.016V) are saturating the output.. This also would allow real time download of useful information, such as the optimal routes to take. Previous: Selecting Power Supply for Car Amplifiers, Next: High Voltage Battery Charger Circuit. U sure this circuit works? Each transistor base consists of voltage divider which gives necessary bias for the individual transistor. Patents have been filed by several companies for LiFi application in the automobile sector, meaning that the technology could be used to increase road safety or … I need to ask one more thing that we are supplying positive VCC directly to LED terminal, is it fine? The project claims to double WiFi’s range of connectivity while also using less power. In technical terms, Li-Fi is a light communication system that is capable of transmitting data at high speeds over the visible light, ultraviolet, and infrared spectrums. Each light fixture in the application environment becomes a separate data channel. Would a stereo setup require some micro-controller circuitry? hi swag …can i send data more then 1M mebe text file or a picture for 2meters ..and can i buy it and export the circuit for iraq. Can you please briefly explain how will the LED respond to positive music peaks which may be above 0.6V, because the LED is already ON through R2? Om, the Vcc line is the positive, and all the wires linked with this line are positive. LiFiComm is the leader in promoting LiFi – ground breakthrough technology since ever, with aim to deploying, delivering as well as co-development projects of LiFi system in many vertical sectors. eventhough I too prefer skipping such questions I finally end up answering them just to make sure nobody gets hurt and feel ignored. sir, I am working on the research project on Li-Fi. The term was first introduced by Harald Haas during a 2011 TEDGlobal talk in Edinburgh.. thanks very much AM CALLED KAKUMBA DAVIS. I would suggest you past this comment in the article as update, if possible. No, the above circuit is not modulated with a carrier wave. It works for me ! Thanks sir, But how should i limit the output voltage to around 3.2Volts that can be handled by LED. Your email address will not be published. In Tx input join the 6 signal via diodes, at the output side connect two LEDs in parallel with opposite polarities (anti-parallel)…make sure each one has its own 1K resistor. alternatively you can also try the LM386 circuit with an LDR for a more responsive performance. That’s awesome ATR, the issue could be perhaps due very feeble output from the solar module, you can try adding a LM386 kind of amp in the middle to boost the solar chip output and then this could be fed to the amplifier for the final amplification, just a suggestion though! Required fields are marked *. LiFi technology is very simple from a functional point of view. The above explained Li-Fi circuit can also be tried using a photodiode as shown below, where the amplifier section is replaced with a LM386 amplifier circuit: In this Li-Fi the LED does flicker, but it is in-significant for our eyes to detect. I have used old-school home theater’s amplifier which had very good sensitivity and the resulting output was LOUD and CLEAR. A must-read book for anyone interested in Optical and Wireless Networks. If you have any circuit related query, you may interact through comments, I'll be most happy to help! The Signal received is very very low. Our objectives are rolling out full scale projects to our customers, not only proof of concept. nothing digital at all. The sound output is given by the speaker. What's that 100e 5watt, its solar panel.And can I use 12v2amp for receiver, that's a resistor, you can try some other amplifier circuit if you find this one difficult or crude in its layout. Conventional wiring systems involve cables and infrastructures, such as junction boxes, conduits, termination racks, cabinets, marshalling panels, enclosures, cable trays and conduits, which in turn increase the capital costs and pose potential problems during installation and modification. Hello sir, I have designed exactly the same circuit as yours, but i am using function generator instead of Audio in. thanks, Swag. The paper also describes the first LiFi transmitter and receiver ASICs (application specific integrated circuits) developed at the University of Edinburgh as part of the UP-VLC project. The LEDs lit up and stay ON with or without the music signal from my phone. For instance, there are different Social Media are available, in that Facebook is one kind of web application in real-time. SIR SOLAR IS BETTER OR PHOTO DIODE IS FOR TRANSMITTER CIRCUIT. The comment sections are just filled with stupidity and ignorance because you bother to answer questions like, "sir, i am working on the research project on lifi so please provide me more information regarding lifi." The amplifier must have good sensitivity since the input is feeble. ... Start trying out LiFi technology yourself! I used BC338. if its yes can you send me a video? You can use any amplifier with good sensitivity for receiver part. I am assuming you have connected the LED with the function generator output, in that case you can connect a resistor in series with the LED to limit current and optimize the volts automatically, however if this 8V is constantly available then that's incorrect and your function generator could be faulty according to me. Sanjay, the biggest terminal is the common ground, the other smaller two are for the left/right inputs. This time, my input is an AV jack from an old DVD player. which type of amplifier can we use for our receiving circuit,can we make one of that and if yes then how?? If your eyes can detect those flickers, something wrong with the build. use 5V as the supply, Hi deepak, You can try: https://homemade-circuits.com/2016/02/how-to-make-simple-laser-communicator.html. With you Ananth, yes 9V can be any small signal transistor such as airplanes hospitals... 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